Optimized motor rotor and micro motor
By employing a separately configured magnet structure and a convex-concave interlocking design in the micro motor, the problems of magnet loosening and connection stability in micro motors are solved, achieving efficient energy conversion and stable operation, and meeting the needs of miniaturization.
Patent Information
- Application Number
- CN202520023749.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-01-06
AI Technical Summary
In micro motors, how can we reduce the amount of magnetic material used while ensuring that performance is not reduced, and how can we solve the problem of possible displacement or loosening of the magnet during rotation?
The rotor body is used with separate first and second magnets. The magnets are fixed by setting corresponding first and second grooves on the rotor body. The magnetic field distribution and connection stability are optimized by using convex and concave structure fitting and convex column separation.
It improves the connection stability between the magnet and the rotor body, optimizes the magnetic field distribution, enhances the stable operation and energy conversion efficiency of the motor, reduces cogging torque, and meets the requirements of micro devices for high performance, miniaturization and reliability.
Smart Images
Figure CN223713678U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of micro motor, especially a kind of optimized motor rotor and micro motor. BACKGROUND
[0002] Brushless DC motor is composed of motor main body and driver, and is a typical mechatronics product. The permanent magnet of small and medium capacity brushless DC motor is now mostly made of high magnetic energy level rare earth neodymium iron boron (Nd-Fe-B) material.
[0003] Neodymium iron boron (NdFeB) material is an alloy composed of neodymium, iron and boron, with excellent magnetic properties, widely used in multiple high-tech fields.
[0004] In recent years, the price of neodymium iron boron (NdFeB) material has risen significantly, so it has also increased the production cost of motor rotor indirectly, so some technical solutions have been proposed in the prior art to reduce the amount of magnetic material in the motor rotor.
[0005] However, in the micro motor, the motor rotor itself is small in size, so after reducing the amount of magnetic material, how to ensure that its performance will not be reduced, and how to assemble and produce, are also technical problems to be solved. INVENTION CONTENTS
[0006] The utility model aims at providing a technical scheme that can solve the above problems.
[0007] The utility model provides a kind of optimized motor rotor, including rotor assembly, the rotor assembly is installed in the internal space of the stator assembly of micro motor, and rotates under the drive of the stator coil of stator assembly;The rotor assembly is equipped with rotor body and magnetic piece, and the magnetic piece is sleeved on the rotor body;Stator coil is equipped with first coil and second coil separated from each other, and the magnetic piece is equipped with first magnet and second magnet, and the first magnet and the second magnet are separated from each other and sleeved on the rotor body, and the first magnet is sleeved on the position corresponding to the first coil of rotor body, and the second magnet is sleeved on the position corresponding to the second coil of rotor body.
[0008] As a further scheme of the utility model: the position corresponding to the first coil of the rotor body is equipped with first recess, and the position corresponding to the second coil is equipped with second recess, the first magnet is sleeved in the first recess of rotor body, and the second magnet is sleeved in the second recess of rotor body.
[0009] As a further scheme of the utility model: the inner side wall of the first groove and the second groove is equipped with convex and concave structure respectively, the first magnet and the second magnet are equipped with concave and convex structure respectively in the position corresponding to the convex and concave structure, the convex and concave structure and the concave and convex structure are embedded each other, form fixed connection.
[0010] As a further scheme of the utility model: the convex and concave structure of the first groove and the convex and concave structure of the second groove are staggered with each other;The concave and convex structure of the first magnet and the concave and convex structure of the second magnet are staggered with each other.
[0011] As a further scheme of the utility model: the first magnet and the second magnet are equipped with center hole respectively at the axle center, thereby forming annular shape, make it can be set in rotor body;The inner ring surface of the first magnet and the bottom surface of the first groove form first gap, and the inner ring surface of the second magnet and the bottom surface of the second groove form second gap.
[0012] As a further scheme of the utility model: the first groove and the second groove of the rotor body are further equipped with convex column, the convex column is set in rotor body and forms fixed connection, and forms separation effect to the first magnet and the second magnet.
[0013] As a further scheme of the utility model: the rotor body is further equipped with rotor shaft, the rotor shaft is fixedly connected to the rotor body, and is coaxially arranged with the rotor body.
[0014] As a further scheme of the utility model: the rotor body and the rotor shaft are further equipped with adapter column, one side of the adapter column is fixedly connected to the rotor body, and the other side is fixedly connected to the rotor shaft, so that the rotor shaft is fixedly connected to the rotor body.
[0015] As a further scheme of the utility model: the rotor body and the rotor shaft are further equipped with adapter plate, the outer circumferential surface of the adapter plate is fixedly connected to the rotor body, and the inner circumferential surface is fixedly connected to the rotor shaft, so that the rotor shaft is fixedly connected to the rotor body.
[0016] The utility model also provides a kind of micro motor, including the motor rotor of above-mentioned optimization, further including stator assembly, shell, cover plate and wire box, the shell is equipped with containing space, the stator assembly is fixedly connected to shell, the rotor assembly is rotatably connected to shell, the cover plate is buckled and connected to shell, and the wire box is fixedly connected to the outer wall of shell.
[0017] Compared with prior art, the utility model has the beneficial effects that:
[0018] 1. The motor rotor of the utility model adopts the structure that the rotor body combines with the first magnet and the second magnet which are separately arranged, and fixes the magnet by setting corresponding first groove and second groove on the rotor body, this design not only improves the connection stability of the magnet and the rotor body, but also can accurately match according to the distribution of stator coil, optimizes the magnetic field distribution, and improves the energy conversion efficiency.
[0019] 2. The convex-concave structure of the inner wall of the first groove and the second groove and the convex-concave structure on the magnet are embedded with each other, and the convex-concave structures of the two are staggered, which further enhances the fixing effect of the magnet on the rotor body, prevents the displacement or loosening of the magnet during rotation, and ensures the stable operation of the motor.
[0020] 3. The first gap and the second gap formed between the first magnet and the second magnet and the groove bottom surface respectively, and the convex column between the first groove and the second groove, not only facilitate the installation and fixation of the magnet, but also can adjust the magnetic field distribution to a certain extent and reduce the cogging torque. At the same time, the convex column also plays a separating role for the first magnet and the second magnet, avoids mutual interference between the two, and improves the performance of the rotor.
[0021] Therefore, through the above improvement, the utility model not only provides an optimized motor rotor, but also applies it to the overall design of the micro motor, including reasonable cooperation with the stator assembly, the shell, the cover plate and the lead box and other components, forms a compact structure, excellent performance micro motor system, and can better meet the high performance, miniaturization and reliability requirements of various micro devices for the motor.
[0022] The additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be known through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.
[0024] Figure 1 It is the cross section schematic view of the magnetic part and the rotor body in the assembly process of the utility model;
[0025] Figure 2 It is the cross section schematic view of the magnetic part and the rotor body assembly completion waiting for hot melting fixation of the utility model;
[0026] Figure 3It is the cross section schematic view of the magnetic part and the rotor body after hot melt fixing of the utility model;
[0027] Figure 4 It is the cross section schematic view of the first magnet and the second magnet of the utility model;
[0028] Figure 5 It is the cross section schematic view of the adapter column of the utility model;
[0029] Figure 6 It is the cross section schematic view of the rotor assembly and the stator assembly of the utility model;
[0030] Figure 7 It is the structure schematic view of the magnetic part and the rotor body in the state of separating each other of the utility model.
[0031] The reference signs and names in the drawing are as follows:
[0032] 10 rotor assembly; 11 magnetic part; 12 first magnet; 13 second magnet; 14 concave-convex structure; 15 center hole; 16 flared portion; 20 rotor body; 21 protruding column; 22 first groove; 23 second groove; 24 convex-concave structure; 25 first gap; 26 second gap; 30 rotor shaft; 31 shaft hole; 32 adapter column; 33 adapter plate; 34 output gear; 40 micro motor; 41 shell; 42 cover plate; 43 wire box; 44 stator assembly; 45 center shaft; 46 stator coil; 47 first coil; 48 second coil. DETAILED DESCRIPTION
[0033] The technical scheme in the embodiments of the utility model will be described clearly and completely below, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of protection of the utility model.
[0034] Please refer to Figures 1 to 7 In the embodiments of the utility model, a kind of optimized motor rotor, including rotor assembly 10, the rotor assembly 10 is installed in the internal space of micro motor 40 stator assembly 44, and under the drive of stator coil 46 of stator assembly 44, it is rotated;The rotor assembly 10 is equipped with rotor body 20 and magnetic part 11, the magnetic part 11 is sleeved in rotor body 20;Stator coil 46 is equipped with first coil 47 and second coil 48, which are separated from each other, the magnetic part 11 is equipped with first magnet 12 and second magnet 13, first magnet 12 and second magnet 13 are separated from each other and sleeved in rotor body 20, and first magnet 12 is sleeved in the position corresponding to first coil 47 of rotor body 20, and second magnet 13 is sleeved in the position corresponding to second coil 48 of rotor body 20.
[0035] Specifically, in order to minimize the material usage of the magnetic member 11 and ensure that it generates sufficient magnetic field strength corresponding to the stator coil 46, it is preferred to arrange the corresponding magnetic member 11 at the position corresponding to the stator coil 46, and not to arrange the magnetic member 11 at other positions, thereby saving the production cost of the motor rotor.
[0036] Secondly, the optimized motor rotor can reduce the volume and weight under the premise of ensuring the performance, better adapt to the special needs of miniaturization and light weight, and provide support for the portability and energy saving of the equipment.
[0037] As shown in Figure 1 and Figure 7 , preferably, the rotor body 20 is provided with a first recess 22 corresponding to the position of the first coil 47 and a second recess 23 corresponding to the position of the second coil 48, the first magnet 12 is sleeved in the first recess 22 of the rotor body 20, and the second magnet 13 is sleeved in the second recess 23 of the rotor body 20.
[0038] Specifically, the first recess 22 and the second recess 23 can be recesses pre-installed or pre-formed on the outer side wall of the rotor body 20 when the rotor body 20 is produced; or can be recesses formed by heat melting the two ends of the rotor body 20 to fix the magnetic member 11 after the magnetic member 11 is sleeved on the rotor body 20.
[0039] Secondly, the motor rotor of the utility model adopts the structure of the rotor body 20 combined with the separately arranged first magnet 12 and second magnet 13, and fixes the magnets by arranging the corresponding first recess 22 and second recess 23 on the rotor body 20, which not only improves the connection stability of the magnets and the rotor body 20, but also can accurately match according to the distribution of the stator coil 46, optimize the magnetic field distribution, and improve the energy conversion efficiency.
[0040] As shown in Figure 1 and Figure 7 , preferably, the inner side walls of the first recess 22 and the second recess 23 are respectively provided with convex-concave structures 24, the first magnet 12 and the second magnet 13 are respectively provided with concave-convex structures 14 corresponding to the positions of the convex-concave structures 24, and the convex-concave structures 24 and the concave-convex structures 14 are embedded with each other to form a fixed connection.
[0041] Specifically, the first groove 22 and the second groove 23 are provided with the inner side wall of the convex-concave structure 24, which can be the inner side wall of one end close to each other, or the inner side wall of one end away from each other, or the inner side wall of both ends. The first magnet 12 and the second magnet 13 are provided with the position of the concave-convex structure 14, which can be one end close to each other, or one end away from each other, or both ends provided with the concave-convex structure 14. It can be understood that in order to realize the connection structure of embedding each other, one end of the magnetic part 11 provided with the concave-convex structure 14 should correspond to the position of the convex-concave structure 24 of the rotor body 20.
[0042] As shown in Figure 1 and Figure 7 , preferably, the convex-concave structure 24 of the first groove 22 and the convex-concave structure 24 of the second groove 23 are staggered; the concave-convex structure 14 of the first magnet 12 and the concave-convex structure 14 of the second magnet 13 are staggered.
[0043] Specifically, in order to make the weight of the rotor body 20 more uniform and balanced, it is preferred that the convex-concave structure 24 provided on the rotor body 20 is staggered, and similarly, the concave-convex structure 14 on the two magnetic parts 11 is also staggered. Moreover, the convex-concave structure 24 on the rotor body 20 and the concave-convex structure 14 on the magnetic part 11 can be uniformly distributed around the circumference. For example, four convex structures are provided in the first groove 22, respectively arranged at 0 degrees, 90 degrees, 180 degrees and 270 degrees in the circumferential direction of the rotor body 20. While the four convex structures provided in the second groove 23 should be respectively arranged at 45 degrees, 135 degrees, 225 degrees and 315 degrees in the circumferential direction of the rotor body 20.
[0044] Secondly, the convex-concave structure 24 of the inner side wall of the first groove 22 and the second groove 23 and the concave-convex structure 14 on the magnet are embedded with each other, and the convex-concave structure 24 of the two is staggered, which further enhances the fixing effect of the magnet on the rotor body 20, prevents the displacement or loosening of the magnet during rotation, and ensures the stable operation of the motor.
[0045] As shown in Figure 1 and Figure 2 , preferably, the first magnet 12 and the second magnet 13 are respectively provided with a center hole 15 at the center, thereby forming a ring shape, so that they can be sleeved on the rotor body 20; the inner ring surface of the first magnet 12 and the bottom surface of the first groove 22 form a first gap 25, and the inner ring surface of the second magnet 13 and the bottom surface of the second groove 23 form a second gap 26.
[0046] Specifically, the first gap 25 and the second gap 26 are arranged to keep a certain gap between the magnetic member 11 and the rotor body 20, so that the penetration of the adhesive is facilitated during assembly production, and a good bonding state is formed. Alternatively, when the two ends of the rotor body 20 made of plastic are subjected to heat melting treatment, the molten adhesive can easily enter the gap for corresponding filling and bonding, so that the magnetic member 11 can be more stably fixed on the rotor body 20.
[0047] Secondly, the outer peripheral diameter of the side wall of the one end of the first groove 22 and the second groove 23 away from each other can be equal to or slightly smaller than the inner annular surface diameter of the magnetic member 11, so that the magnetic member 11 can pass through the side wall during assembly production, and thus be sleeved in the first groove 22 or the second groove 23.
[0048] Thirdly, in order to better fix the magnetic member 11, a flared portion 16 can be arranged on the inner annular surface of the one end of the first magnet 12 and the second magnet 13 away from each other, so that the bonded adhesive or the molten adhesive can be attached at the flared portion 16, preventing the two ends of the magnetic member 11 from protruding and forming a sharp spike, which affects the appearance and quality of the product.
[0049] In addition, the first gap 25 and the second gap 26 respectively formed between the first magnet 12 and the second magnet 13 and the groove bottom surface, and the protruding column 21 between the first groove 22 and the second groove 23, are beneficial to the installation and fixation of the magnets, and can also adjust the magnetic field distribution to a certain extent and reduce the cogging torque.
[0050] As shown in Figures 1 to 5 Preferably, the rotor body 20 is further provided with a protruding column 21 between the first groove 22 and the second groove 23, the protruding column 21 is sleeved on the rotor body 20 and forms a fixed connection, and has a separating effect on the first magnet 12 and the second magnet 13.
[0051] Specifically, the diameter of the outer annular surface of the protruding column 21 is equal to or smaller than the diameter of the outer annular surface of the magnetic member 11. The protruding column 21 can be separately produced and sleeved on the rotor body 20. Alternatively, it can be directly produced by an integrated molding process in the prior art. The end faces of the two ends of the protruding column 21 form the inner side walls of the first groove 22 and the second groove 23 on the side close to each other, respectively. At the same time, the protruding column 21 also has a separating effect on the first magnet 12 and the second magnet 13, avoiding mutual interference between them and improving the performance of the rotor.
[0052] As shown in Figures 1 to 5 Preferably, the rotor body 20 is further provided with a rotor shaft 30, the rotor shaft 30 is fixedly connected to the rotor body 20 and is coaxially arranged with the rotor body 20.
[0053] Specifically, in order to better drive the rotor assembly 10 to rotate, a central shaft 45 can be arranged at the axis of the stator assembly 44 of the micro motor, so that the rotor assembly 10 can be rotatably connected to the central shaft 45. The rotor shaft 30 can also be provided with a shaft hole 31 at the axis thereof, so as to be sleeved on the central shaft 45 of the micro motor, and the rotor shaft 30 and the central shaft 45 are rotatably connected. One end of the rotor shaft 30 is also provided with an output gear tooth 34 for outputting the rotating power externally.
[0054] As shown in Figures 2 to 5 Preferably, a connecting column 32 is arranged between the rotor body 20 and the rotor shaft 30, one side of the connecting column 32 is fixedly connected to the rotor body 20, and the other side is fixedly connected to the rotor shaft 30, so as to fixedly connect the rotor shaft 30 to the rotor body 20.
[0055] Specifically, in order to save materials and reduce weight, a relatively large through hole can be arranged between the rotor body 20 and the rotor shaft 30. Then the connecting column 32 is arranged in the through hole, and the connecting column 32 can be used to install and fix the rotor shaft 30 at the axis of the rotor body 20. Preferably, the central axis of the connecting column 32 can be arranged to be parallel to the central axis of the rotor shaft 30, so as to stably support the rotor shaft 30 on the axis thereof.
[0056] As shown in Figures 2 to 5 Preferably, a connecting plate 33 is arranged between the rotor body 20 and the rotor shaft 30, the outer circumferential surface of the connecting plate 33 is fixedly connected to the rotor body 20, and the inner circumferential surface thereof is fixedly connected to the rotor shaft 30, so as to fixedly connect the rotor shaft 30 to the rotor body 20.
[0057] Specifically, in order to further enhance the connection stability of the rotor shaft 30 and the rotor body 20, the connecting plate 33 can be arranged, and the entire circumferential surface of the connecting plate 33 is fixedly connected to the rotor body 20 and the rotor shaft 30 respectively, so as to enhance the stability. Preferably, the connecting plate 33 can be arranged at a position corresponding to the protruding column 21 in the axial direction of the rotor body 20, so as to further enhance the structural strength of the rotor body 20 in combination with the protruding column 21.
[0058] Secondly, the rotor body 20 and the rotor shaft 30 are fixedly connected through the connecting column 32 or the connecting plate 33, and the coaxial arrangement of the two is ensured. This stable and reliable connection mode can ensure the synchronous rotation between the rotor shaft 30 and the rotor body 20, transmit greater torque, and improve the power output capacity of the motor.
[0059] As shown in Figure 6As shown, preferably, the utility model still provides a kind of micro motor, including the rotor assembly 10 above-mentioned, still including stator assembly 44, shell 41, cover plate 42 and wire box 43, the accommodating space is equipped in shell 41, stator assembly 44 is fixedly connected in shell 41, the rotor assembly 10 is rotatably connected in shell 41, the cover plate 42 buckle connection is connected in shell 41, wire box 43 is fixedly connected in the outer wall of shell 41.
[0060] Specifically, wire box 43 can be provided with corresponding wire, for the stator coil 46 in stator assembly 44 is connected to external power, so as to provide operating power for micro motor.Power inside shell 41 can also be installed prior art gear set, and with output gear teeth 34 form meshing, so as to transmit the power output by center shaft 45, output to the outside.
[0061] Secondly, the utility model not only provides optimized motor rotor, but also is applied to the overall design of micro motor, including reasonable cooperation with stator assembly 44, shell 41, cover plate 42 and wire box 43 etc.parts, forms a compact structure, excellent micro motor system, can better meet the high performance, miniaturization and reliability requirements of various micro devices to motor.
[0062] Production, such as Figure 1 As shown, rotor body 20 can be produced by one-piece molding process first, and corresponding convex column 21, first recess 22 and second recess 23, and corresponding convex and concave structure 24, adapter column 32, adapter plate 33 and rotor shaft 30 are provided on rotor body 20.
[0063] Then the pre-produced magnetic piece 11 is set on the rotor body 20.The magnetic piece 11 can be pre-provided with corresponding concave and convex structure 14, center hole 15 and flared portion 16.The diameter of the outer side wall at both ends of the rotor body 20 is equal to or slightly smaller than the diameter of the inner annular surface of the magnetic piece 11, so that the magnetic piece 11 can be smoothly fitted into the recessed portion of the rotor body 20.The convex and concave structure 24 of the rotor body 20 and the concave and convex structure 14 of the magnetic piece 11 are embedded in each other, limiting the magnetic piece 11 from rotating along the circumference of the rotor body 20, and ensuring that the magnetic piece 11 and the rotor body 20 are coaxially arranged.
[0064] Finally, adhesive can be used between the magnetic piece 11 and the rotor body 20, or the two ends of the rotor body 20 can be heat treated and then subjected to corresponding hot pressing operation, so that the molten adhesive can penetrate into the first gap 25 and the second gap 26, and the end face of the two ends of the rotor body 20 can be pressed into the flared portion 16 of the magnetic piece 11, so that the two are firmly bonded together.
[0065] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than by the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims
1. An optimized motor rotor, characterized by, The rotor assembly (10) is installed in the inner space of the stator assembly (44) of the micro motor and rotates under the driving of the stator coil (46) of the stator assembly (44); the rotor assembly (10) is provided with a rotor body (20) and a magnetic member (11) sleeved on the rotor body (20); the stator coil (46) is provided with a first coil (47) and a second coil (48) arranged separately from each other; the magnetic member (11) is provided with a first magnet (12) and a second magnet (13) sleeved on the rotor body (20) separately from each other, and the first magnet (12) is sleeved on the rotor body (20) at a position corresponding to the first coil (47), and the second magnet (13) is sleeved on the rotor body (20) at a position corresponding to the second coil (48).
2. An optimized motor rotor as claimed in claim 1, wherein, The rotor body (20) is provided with a first groove (22) at a position corresponding to the first coil (47) and a second groove (23) at a position corresponding to the second coil (48), the first magnet (12) is sleeved in the first groove (22) of the rotor body (20), and the second magnet (13) is sleeved in the second groove (23) of the rotor body (20).
3. An optimized motor rotor as claimed in claim 2, wherein, The inner side walls of the first groove (22) and the second groove (23) are respectively provided with convex-concave structures (24), the first magnet (12) and the second magnet (13) are respectively provided with concave-convex structures (14) at positions corresponding to the convex-concave structures (24), and the convex-concave structures (24) and the concave-convex structures (14) are embedded with each other to form fixed connections.
4. An optimized motor rotor as claimed in claim 3, wherein, The convex-concave structures (24) between the first groove (22) and the second groove (23) are arranged alternately with each other, and the concave-convex structures (14) between the first magnet (12) and the second magnet (13) are arranged alternately with each other.
5. An optimized motor rotor as defined in claim 2, wherein, The first magnet (12) and the second magnet (13) are respectively provided with central holes (15) at the shaft centers thereof, so as to form annular shapes and be sleeved on the rotor body (20); a first gap (25) is formed between the inner annular surface of the first magnet (12) and the bottom surface of the first groove (22), and a second gap (26) is formed between the inner annular surface of the second magnet (13) and the bottom surface of the second groove (23).
6. An optimized motor rotor as defined in claim 2, wherein, The rotor body (20) is further provided with a convex column (21) between the first groove (22) and the second groove (23), the convex column (21) is sleeved on the rotor body (20) and forms a fixed connection, and separates the first magnet (12) and the second magnet (13).
7. An optimized motor rotor as defined in claim 1, wherein, The rotor body (20) is further provided with a rotor shaft (30) fixedly connected to the rotor body (20) and coaxially arranged with the rotor body (20).
8. An optimized motor rotor according to claim 7, characterized in that, The rotor body (20) and the rotor shaft (30) are further provided with a connecting column (32), one side of the connecting column (32) is fixedly connected with the rotor body (20), and the other side is fixedly connected with the rotor shaft (30), so that the rotor shaft (30) is fixedly connected with the rotor body (20).
9. An optimized motor rotor as claimed in claim 7, wherein, The rotor body (20) and the rotor shaft (30) are further provided with a connecting plate (33), the outer periphery of the connecting plate (33) is fixedly connected with the rotor body (20), and the inner periphery is fixedly connected with the rotor shaft (30), so that the rotor shaft (30) is fixedly connected with the rotor body (20).
10. A micromotor characterized by The optimized motor rotor comprises a stator assembly (44), a shell (41), a cover plate (42) and a wire box (43), the shell (41) is provided with an accommodating space, the stator assembly (44) is fixedly connected with the shell (41), the rotor assembly (10) is rotationally connected with the shell (41), the cover plate (42) is snap-fit connected with the shell (41), and the wire box (43) is fixedly connected with the outer wall of the shell (41).